Navigation Links
At small scales, tug-of-war between electrons can lead to magnetism
Date:6/30/2011

e to "win."

Through complex calculations, however, Oszwałdowski, utić and Petukhov show that the quantum dot's two mobile electrons will actually influence the manganese spins differently.

That's because while one mobile electron prefers to stay in the middle of the quantum dot, the other prefers to locate further toward the edges. As a result, manganese atoms in different parts of the quantum dot receive different messages about which way to align their spins.

In the "tug-of-war" that ensues, the mobile electron that interacts more intensely with the manganese atoms "wins," aligning more spins and causing the quantum dot, as a whole, to be magnetic. (For a visual representation of this tug-of-war, see Figure 1.)

This prediction, if proven, could "completely alter the basic notions that we have about magnetic interactions," utić says.

"When you have two mobile electrons with opposite spins, the assumption is that there is a nice balance of up and down spins, and therefore, there is no magnetic message, or nothing that could be sent to align nearby manganese spins," he says. "But what we are saying is that it is actually a tug of war. The building blocks of magnetism are still mysterious and hold many surprises."

Scientists including UB Professor Athos Petrou, UB College of Arts and Sciences Dean Bruce McCombe and UB Vice President for Research Alexander Cartwright have demonstrated experimentally that in a quantum dot with just one mobile electron, the mobile electron will act as a magnetic messenger, robustly aligning the spins of adjacent manganese atoms (http://www.buffalo.edu/news/pdf/June11/Paper2.pdf).

Now, Petrou and his collaborators are interested in taking their research a step further and testing the tug-of-war prediction for two-electron quantum dots, utić says.

utić adds that learning more about magnetism is important as soci
'/>"/>

Contact: Charlotte Hsu
chsu22@buffalo.edu
716-645-4655
University at Buffalo
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Chimerix and BARDA Reach Agreement Ending GAO Review of Smallpox Antiviral Contract
2. Reportlinker Adds Innovations in Protein Kinase Therapies - Significant Proportion of Protein Kinase Pipeline Contains Small Molecule Drugs That Target Oncology
3. Larta Institute Receives Award for National Institutes of Health Commercialization Assistance Program at 2011 Acquisition, Grants, and Small Business Symposium
4. Pitt-led researchers create super-small transistor, artificial atom powered by single electrons
5. Precision Therapeutics ChemoFx® Demonstrates Significant Role in Selection of Chemotherapy Doublets in Non Small Cell Lung Cancer
6. The worlds smallest wedding rings
7. MabVax Therapeutics Receives $1.8 Million in a Phase 2 Small Business Innovation Research Program Award From the National Cancer Institute
8. Top-Line Results Announced of Pivotal Phase 3 Motesanib Trial in Advanced Non-Squamous Non-Small Cell Lung Cancer Patients
9. 3-D printing method advances electrically small antenna design
10. Quantum hot potato: NIST researchers entice 2 atoms to swap smallest energy units
11. Smallest magnetic field sensor in the world
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
At small scales, tug-of-war between electrons can lead to magnetism
(Date:7/31/2014)... Rancho BioSciences , the scientific data ... Suite with tranSMART . Scientists that have ... data in tranSMART to Array Suite for further analysis. ... including the new 1.2 release. Array Suite provides ... the analysis of high dimensional quantification data, including expression, ...
(Date:7/31/2014)... 31, 2014 “Rapid technological advances ... the U.S., increasing unemployment, depressing American consumer spending ... is a Catch 22—we need automated manufacturing if ... fewer jobs,” says economist and corporate relocation expert ... Top 10 Pro-Business States for 2014, co-published with ...
(Date:7/31/2014)... The Kidney Cancer Association (KCA) has established ... magazine, Kidney Cancer News. , Bill Bro, KCA CEO, ... maintained by an international news organization. When we began using ... , This month’s program highlights news of an enzyme that ... a recent study. Kidney Cancer News also presents a report ...
(Date:7/30/2014)... Calif. , July 30, 2014 ... a biopharmaceutical company leading the discovery and development of ... report financial results and highlights for the quarter ended ... the U.S. financial markets close. Regulus ... August 6, 2014, at 5:00 pm Eastern Daylight Time ...
Breaking Biology Technology:Rancho BioSciences, in Partnership with Omicsoft, have Integrated Array Suite with tranSMART 2Rancho BioSciences, in Partnership with Omicsoft, have Integrated Array Suite with tranSMART 3ITRA Global Affiliate’s Pollina Corporate Top 10 Pro-Business States Minimize the Impact of Automation on Middle Class and Unemployment 2ITRA Global Affiliate’s Pollina Corporate Top 10 Pro-Business States Minimize the Impact of Automation on Middle Class and Unemployment 3ITRA Global Affiliate’s Pollina Corporate Top 10 Pro-Business States Minimize the Impact of Automation on Middle Class and Unemployment 4Regulus Announces Timing for Second Quarter 2014 Financial Results Webcast and Conference Call 2Regulus Announces Timing for Second Quarter 2014 Financial Results Webcast and Conference Call 3
... most conductive material, discovered in 2004 at the University ... Novoselov, has the potential to revolutionize material science. , ... scientists the Nobel Prize for Physics last year and ... plans for a 50m graphene research hub to be ...
... Novelda AS announced today two new antennas for its CMOS Impulse ... on a Sinuous Antenna geometry. The antenna itself consists of two ... the antenna itself; the lower PCB is a balancing network. The ... can be lowered by attaching a lens. This lens is built ...
... AlloSource, ( www.allosource.org ) a leading developer, ... use in surgical procedures around the world, is among ... Denver Business Journal,s inaugural awards program. With concerns ... employee benefits, the Denver Business Journal sought ...
Cached Biology Technology:Graphene's 'Big Mac' creates next generation of chips 2Wideband Antenna for Novelda Nanoscale Impulse Radar 2AlloSource Named One of Denver's Healthiest Employers 2AlloSource Named One of Denver's Healthiest Employers 3
(Date:7/31/2014)... Hibiscus flowers- they are an iconic symbol of ... in the landscape. Some, like Hawaii,s State Flower- ... Only a relatively few botanists and Hawaiian conservation ... and intriguing related group of plants known as ... Brother of Hibiscus species are in fact highly ...
(Date:7/31/2014)... NXT-ID, Inc., (NXTD: OTCQB) a biometric authentication company ... and consumers wanting to learn more about its  ... on-air today, July 31 st . ... featured in a segment of NewsWatch, a weekly ... the History Channel, FYI Network today. ...
(Date:7/30/2014)... uses reversible epigenetic processes to regulate its genes, and ... a picture of the genome regulation taking place in ... Genome Biology and illustrates how the truffle ... genes,. The authors say this may shed light on ... Black truffles (Tuber melanosporum), also known as Prigord truffles, ...
Breaking Biology News(10 mins):Brother of Hibiscus is found alive and well on Maui 2NXT-ID's Next Generation Biometric Smart Wallet Featured on NewsWatch Consumer Show on the History Channel and FYI Network Today, July 31st 2NXT-ID's Next Generation Biometric Smart Wallet Featured on NewsWatch Consumer Show on the History Channel and FYI Network Today, July 31st 3How black truffles deal with the jumpers in their genome 2
... tiny luminescent particles made of semiconductors, hold promise ... doctors were to use them in humans, quantum ... and possible toxicity. Scientists at Emory University ... a way around those limitations by exploiting a ...
... Calif.) The apparent success of a case in which ... marrow transplant comes as no surprise to Gerhard Bauer, a ... more than 10 years on a similar cure for AIDS ... patient with stem cells that have been engineered to resist ...
... discovered that management efforts intended to assist migrations of ... fish populations. Juveniles that are transported downstream on boats ... breeding grounds, reducing their survivorship and altering adaptations in ... place for over three decades to improve the survival ...
Cached Biology News:'Strained' quantum dots show new optical properties 2UC Davis researchers exploring gene therapy to fight AIDS 2UC Davis researchers exploring gene therapy to fight AIDS 3Transporting juvenile salmon hinders adult migration 2Transporting juvenile salmon hinders adult migration 3
... Platypus Contact Printing Kit contains choice ... with series of 100 / 200 micron ... or 200 um x 10 mm lines, ... 20, 40 or 60 nm and pitch ...
Request Info...
Sterile glass 5 mm beads that make spreading bacterial and yeast cultures easy. Can be washed, autoclaved and reused....
... are supplied as 10X concentrated solutions. REact Buffer ... of the REact buffers and one 250 microl ... four 1 ml vials of REact 1 Buffer ... four 1 ml vials of REact 3 Buffer ...
Biology Products: